<?php // $Id: bennu.class.php,v 1.1 2006/01/13 15:06:25 defacer Exp $

/**
 *  BENNU - PHP iCalendar library
 *  (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
 *
 *  Released under the LGPL.
 *
 *  See http://bennu.sourceforge.net/ for more information and downloads.
 *
 * @author Ioannis Papaioannou 
 * @version $Id: bennu.class.php,v 1.1 2006/01/13 15:06:25 defacer Exp $
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */

class Bennu {
	function timestamp_to_datetime($t = NULL) {
		if($t === NULL) {
			$t = time();
		}
		return gmstrftime('%Y%m%dT%H%M%SZ', $t);
	}

	function generate_guid() {
		// Implemented as per the Network Working Group draft on UUIDs and GUIDs
	
		// These two octets get special treatment
		$time_hi_and_version	   = sprintf('%02x', (1 << 6) + mt_rand(0, 15)); // 0100 plus 4 random bits
		$clock_seq_hi_and_reserved = sprintf('%02x', (1 << 7) + mt_rand(0, 63)); // 10 plus 6 random bits
	
		// Need another 14 random octects
		$pool = '';
		for($i = 0; $i < 7; ++$i) {
			$pool .= sprintf('%04x', mt_rand(0, 65535));
		}
	
		// time_low = 4 octets
		$random  = substr($pool, 0, 8).'-';
	
		// time_mid = 2 octets
		$random .= substr($pool, 8, 4).'-';
	
		// time_high_and_version = 2 octets
		$random .= $time_hi_and_version.substr($pool, 12, 2).'-';
	
		// clock_seq_high_and_reserved = 1 octet
		$random .= $clock_seq_hi_and_reserved;
	
		// clock_seq_low = 1 octet
		$random .= substr($pool, 13, 2).'-';
	
		// node = 6 octets
		$random .= substr($pool, 14, 12);
	
		return $random;
	}
}

?>
